200 A Monogi'aph of the Myxogastres. 



Chondrioderma radiatum, Rost. (figs. 92 — 95). 



Sporangia stipitate or sessile, subglobose or depressed, ximhili- 

 cate below, pallid or with a brown tinge, when mature splitting 

 in an irregularly stellate manner from the wpex^ segments re- 

 flexed, persistent; stem, when present, shorter than sporangium, 

 attenuated downwards; columella large, globose or slightly elon- 

 gated, rugulose, pallid or with a rufous tinge ; threads of capil- 

 litium thin, fuliginous, or almost colourless, simple below, then 

 bifurcating at acute angles, now and then combining laterally ; 

 spores globose, violet-brown, minutely tvarted, 9 — 12 ^x diameter, 



Chondrioderma radiatum, Rost,, Mon., p. 182, figs, 152, 153, 

 155, 156, 170; Cooke, Myx, Brit., p, 40, figs, 152, 153, 155, 156, 

 170 ; Schroeter, p. 125. 



Diderma stellare, Fries. Seler. Succ. Exs. 



On wood, bark, &c, Britain (King's Cliffe, Scarboro') ; 

 Sweden ; Germany ; Denmark ; France ; United States. 



Sporangia scattered or loosely gregarious, about '5 mm. 

 diameter before dehiscence. Recognized amongst the species 

 that dehisce in a stellate manner by the umbilicate sporangium, 

 which is constant when the specimens are sessile, the large 

 rugulose pale columella, and the minutely warted spores, 



(Rostafinski's Synonyms.) 

 Lyco'perdon radiatum, Linn., sp., 1654 (1753). 

 Didymium stellare, Schrad,, t. 5, f. 3, 4 (1797). 

 Diderma stellare, Pers, Syn., 164 (1801), 

 Didcrma umbilicatum, Pers, Syn., 165 (1801); Eng, Fl, v., 



310 ; Cke„ Hdbk,, No. 1106. 

 Diderma crassi})es, Schum, Saell, 1421 (1803). 

 Betieularia umbilicata, Poir., Ency. 

 Didymium geaster, Link, diss, ii., 42 (1809), 

 Leangium stellare, Link, diss, ii., 42 (1809). 

 Cionium stellare, Spr. Syst, iv., 529 (1827). 

 Cionixim umbilicatum, Spr. Syst., iv., 529 (1827). 

 Leangium umhilicatiim, Rabh, FI, Crypt., 285 (1844). 

 Didymium comi^lanatum, Fckl., Sym. Myc, 341 (1869). 



